WO2019006666A1 - Touch detection circuit, electronic device, and method for detecting environment temperature of touchscreen - Google Patents

Abstract

A touch detection circuit, an electronic device, and a method for detecting the environment temperature of a touchscreen. The method for detecting the environment temperature of a touchscreen comprises: obtaining original detection data of a touchscreen in an untouched state in a current environment (101); computing a current eigenvalue of the touchscreen according to the original detection data (102); and obtaining an environment temperature corresponding to the current eigenvalue according to a preset correspondence between eigenvalues and temperatures (103). By using the method for detecting the environment temperature of a touchscreen, the current environment temperature of the touchscreen can be obtained, and a basis is provided for temperature drift compensation and temperature drift correction.

Description

Method for detecting ambient temperature of touch detection circuit, electronic device and touch screen Technical field

The present application relates to the field of touch screen technologies, and in particular, to a touch detection circuit, an electronic device, and a method for detecting an ambient temperature of a touch screen.

Background technique

At present, most of the electronic devices on the market (for example, mobile phones, tablet computers, etc.) implement capacitive touch screens for human-computer interaction, and capacitive touch screens detect capacitive touch operations by capacitive sensors. Before detecting the user operation on the touch screen, the touch screen generally establishes a reference original value, and the original value is obtained by sampling the touch control chip, and the original value of the reference reflects the initial state of each sensing node of the capacitive sensor. When a touch object (for example, a finger, a stylus, or the like that can change the inductive capacitance) clicks on the touch screen, the operation such as scribing changes the capacitance of the corresponding position sensing node, and the original value obtained at this time is obtained. The current original value is obtained by subtracting the current original value from the original value of the reference, and the difference can reflect the amount of capacitance change caused by the touch object at the operating position, and the touch coordinates can be calculated and reported according to the difference.

In the process of implementing the present application, the inventors have found that at least the following problems exist in the prior art: when the temperature rises or falls, since the capacitance sensor has a temperature drift characteristic, the original value of the capacitive touch screen also changes accordingly; The difference between the temperature at which the touch screen establishes the original value of the reference and the temperature at which the user touches the touch operation is large, which causes the difference between the current original value and the original value of the reference to include not only the amount of capacitance change caused by the touch object but also the temperature drift. The amount of capacitance change; if the difference is used to calculate and report the touch coordinates, there will be an inaccurate point, a descent point, inaccurate coordinate calculation, etc. The problem of experience; wherein, the elimination point means that the touch object operates on the touch screen and the touch control chip does not report the coordinates, and the point of the touch means that the touch object does not operate on the touch screen and the touch control chip reports the coordinates.

Summary of the invention

An embodiment of the present invention provides a touch detection circuit, an electronic device, and a method for detecting an ambient temperature of a touch screen. The feature value of the touch screen in the current environment is obtained first, so that the current touch screen can be obtained according to the correspondence between the feature value and the temperature. The ambient temperature at the location provides the basis for targeted temperature drift compensation and temperature drift correction.

An embodiment of the present application provides a method for detecting an ambient temperature of a touch screen, including: acquiring original detection data of a touch screen in a current environment and in an untouched state; and calculating a current feature value of the touch screen according to the original detection data; Obtain an ambient temperature corresponding to the current feature value according to a preset correspondence relationship between the feature value and the temperature.

The embodiment of the present application further provides a touch detection circuit, which is applied to the above detection method. The touch detection circuit includes: a processor, a memory, and a touch screen; the processor is connected to the touch screen and the memory; and the memory is used for storing the feature value and the temperature. Corresponding relationship is set; the touch screen is used to obtain original detection data of the touch screen in the current environment and in an untouched state; the processor is configured to calculate a current feature value of the touch screen according to the original detection data, and correspondingly according to the preset value of the feature value and the temperature Relationship, obtain the ambient temperature corresponding to the current feature value.

The embodiment of the present application further provides an electronic device, including: the above touch detection circuit.

Compared with the prior art, the present application obtains the feature value of the touch screen in the current environment, and obtains the current ambient temperature of the touch screen according to the preset correspondence relationship between the feature value and the temperature, thereby being able to compensate and temperature for the targeted temperature drift. The drift correction provides the basis.

In addition, the preset correspondence relationship between the feature value and the temperature is expressed in a functional relationship. This embodiment provides a representation manner of a preset correspondence relationship between a feature value and a temperature.

In addition, the functional relationship is obtained based on the original detection data collected at a temperature that is continuously changed within a preset range in advance, and is obtained by fitting. The embodiment provides a temperature change mode when the preset correspondence relationship between the feature value and the temperature is expressed by a functional relationship. The temperature continuously changes within the preset range, and the data combination of the temperature and the feature value can be recorded as much as possible, thereby Improve the accuracy of curve fitting to obtain more accurate functional relationships.

In addition, the preset correspondence relationship between the feature value and the temperature is expressed in the form of a look-up table. This embodiment provides another representation of the preset correspondence relationship between the feature value and the temperature.

In addition, the look-up table is obtained based on the raw detection data collected at a temperature varying in advance in the preset range. The embodiment provides a temperature change mode when the preset correspondence relationship between the feature value and the temperature is expressed in the form of a comparison table. The temperature variation within the preset range is equal to the continuous change of the temperature, and the error can be controlled. The data combination of the recorded temperature and the characteristic value is reduced, thereby saving the experiment time and quickly establishing the comparison table.

In addition, the original detection data includes the sensing values of all the sensing nodes of the touch area of the touch screen, or the sensing values of the sensing nodes in the partial touch area. This embodiment provides a specific method for acquiring feature values.

In addition, the feature value is an average value or a median value of the respective sensing values. In this embodiment, taking the average value or the median value of the sensing values of each sensing node as the characteristic value has better stability.

In addition, the manner of establishing the preset correspondence relationship between the feature value and the temperature specifically includes: when the temperature in the temperature box changes within the preset range, recording the original detection data of the touch screen located in the temperature box at each temperature; according to the touch screen Calculate the characteristics of the touch screen at various temperatures by the raw detection data at each temperature Value; according to the characteristic value of the touch screen at each temperature, a preset correspondence relationship between the feature value and the temperature is established. This embodiment provides a specific establishment manner of a preset correspondence relationship between a feature value and a temperature.

In addition, in the touch detection circuit, the processor and the memory are integrated in one touch control chip.

In addition, in an electronic device, the touch screen is a capacitive touch screen.

DRAWINGS

The one or more embodiments are exemplified by the accompanying drawings in the accompanying drawings, and FIG. The figures in the drawings do not constitute a scale limitation unless otherwise stated.

1 is a specific flowchart of a method for detecting an ambient temperature of a touch screen according to a first embodiment of the present application;

2 is a schematic diagram of a capacitive touch screen according to a first embodiment of the present application;

3 is a specific flowchart of a method for detecting an ambient temperature of a touch screen according to a second embodiment of the present application;

4 is a scatter diagram of feature values and temperatures of a touch screen according to a second embodiment of the present application;

5 is a curve fitting diagram of characteristic values and temperatures of a touch screen according to a second embodiment of the present application;

FIG. 6 is a block schematic diagram of a touch detection circuit in accordance with a third embodiment of the present application.

Detailed ways

In order to make the objects, the technical solutions and the advantages of the present application more clear, some embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

The first embodiment of the present application relates to a method for detecting an ambient temperature of a touch screen, which is applied to an electronic device (for example, a mobile phone, a tablet computer, etc.) with a touch screen. The touch screen in this embodiment is a capacitive touch screen, but is not limited thereto. Refer to Figure 1 for a specific flow chart of the method for detecting the ambient temperature of the touch screen.

In this embodiment, referring to FIG. 2, the capacitive touch screen generally includes a touch panel and a touch detection circuit. The touch detection circuit includes a processor and a memory, and the processor and the memory can be integrated into the same touch detection chip. The touch panel is a capacitive sensor formed on a substrate. The capacitive sensor generally consists of a driving electrode and a sensing electrode. In a typical mutual capacitive touch screen, each driving electrode and the sensing electrode intersect to form an induction. Node; in Figure 2, five drive electrodes and five sense electrodes are taken as an example to form 25 sensing nodes.

Step 101: Acquire original detection data of the touch screen in a current environment and in an untouched state.

Specifically, the capacitive touch screen acquires the original detection data in the current environment and in the untouched state through the capacitive sensor. Referring to FIG. 2, the touch detection circuit inputs the coding signal of a certain frequency into the driving electrode according to a certain driving manner, and The capacitive signal formed by the signal signal passing through the sensing node causes the sensing electrode to generate a corresponding sensing signal, and the sensing signal is detected by the touch detection circuit, and the internal ADC conversion and digital signal processing can obtain the sensing value of each mutual capacitance sensing node; The original detection data includes the sensing values of all the sensing nodes of the touch area of the touch screen, or the sensing values of the sensing nodes in the partial touch area, that is, the touch screen includes a touch area, and the original detection data may be the entire touch area. The sensing value of all sensing nodes included in the sensor, or the sensing value of all sensing nodes included in a part of the touch area. The touch area here refers to the touchable area, and does not refer to the actual touch area of the finger.

Step 102: Calculate a current feature value of the touch screen according to the original detection data.

Specifically, the touch detection circuit calculates a current feature value of the touch screen according to the sensing values of the sensing nodes of the acquired touch region.

It should be noted that, in this embodiment, the average value of the sensing values of the sensing nodes of the touch area is used as the feature value, but the original value of a certain sensing node may be used as the feature value; or part of the touch area. The maximum or minimum value or the median value of the sensing values of all the sensing nodes included as the eigenvalues; or the maximum or minimum value or the median value of the sensing values of all the sensing nodes on the entire touch area as the eigenvalues; The average or median value of the sensing values of the sensing nodes of the touch area of the touch screen has better stability as compared with other methods.

Step 103: Acquire an ambient temperature corresponding to the current feature value according to a preset correspondence relationship between the feature value and the temperature.

Specifically, the touch detection circuit can acquire the ambient temperature corresponding to the current feature value according to the preset correspondence between the feature value and the temperature. The preset correspondence between the feature value and the temperature may be represented by a functional relationship or a reference table, but the embodiment does not impose any limitation.

Compared with the prior art, the present embodiment obtains the feature value of the touch screen in the current environment, and obtains the current ambient temperature of the touch screen according to the preset correspondence relationship between the feature value and the temperature, so as to be able to compensate for the targeted temperature drift. Temperature drift correction provides the basis.

The second embodiment of the present application relates to a method for detecting an ambient temperature of a touch screen. This embodiment is a refinement of the first embodiment, and the main refinement is: a method for establishing a preset correspondence relationship between a feature value and a temperature. Carry out a specific introduction.

The specific process of establishing the preset correspondence relationship between the feature value and the temperature in this embodiment is as shown in FIG. 3;

There are two ways to represent the preset correspondence between eigenvalues and temperature, which are functional relations. The representations are expressed in the form of a comparison table, which are described below.

The preset correspondence between the eigenvalue and the temperature is expressed in a functional relationship, please refer to Figure 3:

Step 201: When the temperature in an oven changes within a preset range, the original detection data of the touch screen located in the thermostat at each temperature is recorded.

Specifically, the electronic device with the touch screen is placed in the thermostat, and the temperature in the thermostat can be changed within a preset range, and the specific change manner of the temperature may be continuously changed within the preset range, but is not limited thereto, and may also be It is changed at equal intervals within a preset range, and this embodiment does not impose any limitation. Since the preset correspondence relationship is represented by a function relationship, the function relationship is obtained based on the original detection data collected at a temperature that is continuously changed within a preset range, and is obtained by fitting. Therefore, the specific change of the temperature in the thermostat is that the temperature in the thermostat continuously changes within a preset range, but is not limited thereto; the temperature can be recorded in the preset range continuously to record as much data combination as possible of the temperature and the characteristic value. Thus, the accuracy of the curve fitting can be improved to obtain a more accurate functional relationship. While the temperature continuously changes continuously, the processor of the touch detection circuit records the original detection data of the touch screen located in the temperature box at each temperature, that is, the sensing value of all the sensing nodes of the entire touch area of the touch screen, or a partial touch The sensed value of each sensing node in the area.

In this embodiment, the preset temperature of the temperature in the thermostat is [-20, 60]. However, the present embodiment does not impose any limitation on this, and the preset range can be set according to the operating temperature range of the electronic device.

Step 202: Calculate the characteristic value of the touch screen at each temperature according to the original detection data of the touch screen at each temperature.

Specifically, the characteristic value of the touch screen at each temperature is calculated by acquiring the sensing values of the sensing nodes of the touch area of the touch screen at each temperature. Referring to FIG. 4, the temperature in the temperature box is in the range of -20 ° C to 60 ° C. A scatter plot of the touch screen feature values of the electronic device when the internal changes.

Step 203: Establish a preset correspondence relationship between the feature value and the temperature according to the feature value of the touch screen at each temperature.

Specifically, the relationship between temperature and eigenvalue y=f(x) can be obtained by curve fitting, wherein the independent variable x is temperature, and the dependent variable y is the characteristic value of the touch screen, and the characteristic value of the touch screen is brought into the This function calculates the ambient temperature at which the touch screen is currently located. Please refer to FIG. 5, which is a fitting curve implemented in this embodiment.

It should be noted that the curve fitting may adopt a global fitting or a piecewise fitting; it may be a linear fitting or a nonlinear fitting; the curve fitting method adopted in the present embodiment is a global nonlinear fitting, However, this embodiment does not impose any limitation on this.

The preset correspondence between the eigenvalue and the temperature is expressed in the form of a comparison table. Please refer to Figure 3:

Step 201: When the temperature in an oven changes within a preset range, the original detection data of the touch screen located in the thermostat at each temperature is recorded.

Specifically, the electronic device with the touch screen is placed in the thermostat, and the temperature in the thermostat changes within a preset range; since the preset correspondence is expressed in the form of a comparison table, the comparison table is based on the preset range in advance. The original detection data collected at the temperature of the internal interval is obtained; therefore, the specific variation of the temperature in the thermostat is that the temperature in the thermostat is equally spaced within the preset range, but is not limited thereto; the temperature is in a preset range The internal equal interval change can reduce the data combination of the recorded temperature and the characteristic value within the controllable range of the error, thereby saving the experiment time and quickly establishing the comparison table; the temperature in the thermostat is within the preset range. While the intra-equal interval changes, the processor of the touch detection circuit records the original detection data of the touch screen located in the thermostat at each temperature, that is, the sensing value of all the sensing nodes of the entire touch area of the touch screen, or part of the touch area. The sensed value of each sensor node.

In this embodiment, the preset temperature of the temperature in the thermostat is [-20, 60], but this embodiment does not With any restrictions, the preset range can be set according to the operating temperature range of the electronic device.

In addition, the temperature change interval may be set according to the accuracy of the detected temperature. In this embodiment, the temperature change interval is 5, but this embodiment does not impose any limitation.

Step 202: Calculate the characteristic value of the touch screen at each temperature according to the original detection data of the touch screen at each temperature.

Specifically, the characteristic values of the touch screen at each temperature are calculated by acquiring the sensing values of the sensing nodes of the touch area of the touch screen at each temperature. Table 1 below shows the temperature in the temperature box changing within the range of -20 ° C to 60 ° C. A table of touch screen feature values of the electronic device.

Table 1

temperature	Eigenvalues	temperature	Eigenvalues	temperature	Eigenvalues
-20	2044	10	2200	40	2310
-15	2104	15	2215	45	2314
-10	2151	20	2236	50	2333
-5	2166	25	2261	55	2352
0	2170	30	2282	60	2358
5	2177	35	2293

It should be noted that, for better stability, the average value of the sensing values of the sensing nodes of the touched area of the touch screen is taken as the feature value in the embodiment, but is not limited thereto, and may also be a certain sensing node. The original value is used as the feature value; or the maximum or minimum value of the sensing value of all the sensing nodes of a touch area on the touch screen is used as the feature value; or the maximum or minimum value of the sensing value of all the sensing nodes on the entire touch screen is used as the feature value.

Step 203: Establish a preset of the feature value and the temperature according to the feature value of the touch screen at each temperature. Correspondence relationship.

Specifically, Table 1 is used to indicate a preset correspondence relationship between the feature value and the temperature, and the feature value closest to the current touch screen feature value is obtained from the table, and the temperature corresponding to the feature value is used as the current environment in which the touch screen is located. temperature.

Compared with the first embodiment, this embodiment provides a specific establishment manner of a preset correspondence relationship between the feature value and the temperature.

The third embodiment of the present application relates to a touch detection circuit. Referring to FIG. 6, the touch detection circuit includes a processor 1 and a memory 2.

In this embodiment, the processor 1 is connected to a touch screen 3 and a memory 2, and the processor 1 and the storage 2 can be integrated in one touch control chip 12. The touch detection circuit may further include a driving circuit for generating a driving signal and a sensing circuit for detecting the sensing signal, and corresponding processing circuits such as AD conversion, amplification, mixing, and the like.

The memory 2 is configured to store a preset correspondence between the feature value and the temperature. The memory 2 can be a non-volatile memory, and the preset correspondence between the feature value and the temperature is pre-stored in the non-volatile memory, and is powered on the touch screen. In the process of running, only the corresponding relationship needs to be read, no additional complicated operation is needed, and the touch screen is detected to detect the real-time operation of the user, and the operation is simple.

Specifically, the manner in which the preset correspondence between the feature value and the temperature is established includes: when the temperature in an oven changes within a preset range, the processor records the touch screen located in the thermostat at each temperature Original detection data; the processor calculates feature values of the touch screen at the respective temperatures according to original detection data of the touch screen at the respective temperatures; the processor is at the respective temperatures according to the touch screen The lower feature value establishes a preset correspondence relationship between the feature value and the temperature.

In the manner of establishing the preset correspondence relationship between the feature value and the temperature, the electric power with the touch screen is The sub-device is placed in the thermostat, and the temperature in the thermostat can be changed within a preset range. The specific change of the temperature may be continuous change within the preset range, but is not limited thereto, and may be equally spaced within the preset range. Variations, this embodiment does not impose any limitation on this. Wherein, the correspondence between the eigenvalue and the temperature may be represented by a functional relationship, and the functional relationship may be obtained according to the original detection data collected at a temperature that is continuously changed within a preset range, and obtained by fitting, at this time, the thermostat The specific change of the temperature inside the temperature box may be that the temperature in the thermostat continuously changes within a preset range; however, the correspondence between the characteristic value and the temperature may also be represented by a comparison table form, and the comparison table may be pre-predicted according to The original detection data collected at a temperature in which the interval is varied is obtained. At this time, the specific change of the temperature in the thermostat may be that the temperature in the thermostat is equally changed within a preset range. A specific method for establishing a preset correspondence relationship between the feature values and the temperature is described in detail in the second embodiment, and details are not described herein again.

The touch screen 3 is configured to acquire original detection data of the touch screen in the current environment and in an untouched state, where the original detection data includes the sensing values of all the sensing nodes of the touch area of the touch screen, or includes the sensing in the partial touch area. The sensed value of the node. The touch screen may be a capacitive touch screen, but is not limited thereto, and may be a resistive touch screen or the like. This embodiment does not impose any limitation.

The processor 1 is configured to calculate a current feature value of the touch screen according to the original detection data, where the feature value is an induction value of all the sensing nodes of the touch area of the touch screen, or an average value of the sensing values of the sensing nodes in the partial touch area or The median value can be obtained according to the preset correspondence relationship between the feature value and the temperature, and the ambient temperature corresponding to the current feature value is obtained.

Since the first embodiment and the second embodiment correspond to the present embodiment, the present embodiment can be implemented in cooperation with the first embodiment and the second embodiment. The related art details mentioned in the first embodiment and the second embodiment are still effective in the present embodiment, in the first embodiment and the second embodiment. The technical effects that can be achieved are also implemented in this embodiment. In order to reduce the repetition, details are not described herein again. Accordingly, the related art details mentioned in the embodiment can also be applied to the first embodiment and the second embodiment.

Compared with the prior art, the present embodiment obtains the feature value of the touch screen in the current environment, and obtains the current ambient temperature of the touch screen according to the preset correspondence relationship between the feature value and the temperature, so as to be able to compensate for the targeted temperature drift. Temperature drift correction provides the basis.

The fourth embodiment of the present application relates to an electronic device, such as a mobile phone, a tablet computer, or the like. Referring to FIG. 6, the electronic device includes a touch screen 3 and a touch detection circuit in the fourth embodiment.

The touch screen 3 can be a capacitive touch screen. However, it is not limited thereto, and may be a resistive touch screen or the like. This embodiment does not impose any limitation.

Compared with the prior art, this embodiment provides an electronic device that can acquire the temperature of the current environment.

A person skilled in the art can understand that the above embodiments are specific embodiments of the present application, and various changes can be made in the form and details without departing from the spirit and scope of the application. range.

Claims (19)

1. A method for detecting a temperature of a touch screen environment includes:

   Obtaining original detection data of the touch screen in the current environment and in an untouched state;

   Calculating a current feature value of the touch screen according to the original detection data;

   Obtaining an ambient temperature corresponding to the current feature value according to a preset correspondence relationship between the feature value and the temperature.
2. The detecting method according to claim 1, wherein the preset correspondence relationship between the feature value and the temperature is expressed in a functional relationship.
3. The detecting method according to claim 2, wherein the function relation is acquired based on original detection data acquired at a temperature that is continuously changed in a preset range in advance, and is obtained by fitting.
4. The detecting method according to claim 1, wherein the preset correspondence relationship between the feature value and the temperature is expressed in the form of a look-up table.
5. The detecting method according to claim 4, wherein the comparison table is obtained based on original detection data acquired in advance at a temperature varying in intervals within a preset range.
6. The detecting method according to any one of claims 1 to 5, wherein the original detection data includes sensing values of all sensing nodes of all touch regions of the touch screen, or includes sensing nodes in a partial touch region. Inductive value.
7. The detecting method according to claim 6, wherein the characteristic value is an average value or a median value of the respective sensing values.
8. The detecting method according to claim 1, wherein the manner of establishing the preset correspondence between the feature value and the temperature comprises:

   Recording the touch screen located in the incubator when the temperature in an incubator changes within a preset range Raw test data at each temperature;

   Calculating a feature value of the touch screen at the respective temperatures according to the original detection data of the touch screen at the respective temperatures;

   And establishing a preset correspondence relationship between the feature value and the temperature according to the feature value of the touch screen at the respective temperatures.
9. A touch detection circuit includes: a processor and a memory, the processor being coupled to a touch screen and the memory;

   The memory is configured to store a preset correspondence relationship between the feature value and the temperature;

   The touch screen is configured to acquire original detection data of the touch screen in a current environment and in an untouched state;

   The processor is configured to calculate a current feature value of the touch screen according to the original detection data, and obtain an ambient temperature corresponding to the current feature value according to the preset correspondence between the feature value and the temperature.
10. The touch detection circuit according to claim 9, wherein the preset correspondence relationship between the feature value and the temperature is expressed in a functional relationship.
11. The touch detection circuit according to claim 10, wherein the functional relationship is acquired based on original detection data acquired at a temperature that is continuously changed within a preset range in advance, and is obtained by fitting.
12. The touch detection circuit according to claim 9, wherein the preset correspondence relationship between the feature value and the temperature is expressed in the form of a look-up table.
13. The touch detection circuit according to claim 12, wherein said look-up table is obtained based on original detection data acquired in advance at temperatures varying in intervals within a preset range.
14. The touch detection circuit according to any one of claims 9 to 13, wherein the original inspection The measured data includes the sensing values of all the sensing nodes of the touch area of the touch screen, or the sensing values of the sensing nodes in the partial touch area.
15. The touch detection circuit according to claim 14, wherein said characteristic value is an average value or a median value of said respective sensing values.
16. The touch detection circuit of claim 9, wherein the manner in which the preset correspondence between the feature value and the temperature is established comprises:

    The processor records original detection data of the touch screen located in the temperature box at each temperature when the temperature in an oven changes within a preset range;

    The processor calculates a feature value of the touch screen at each temperature according to the original detection data of the touch screen at the respective temperatures;

    The processor establishes a preset correspondence relationship between the feature value and the temperature according to the feature value of the touch screen at the respective temperatures.
17. The touch detection circuit of claim 9, wherein said processor and said memory are integrated in a touch control chip.
18. An electronic device comprising: a touch screen and the touch detection circuit of any one of claims 9 to 17.
19. The electronic device of claim 18, wherein the touch screen is a capacitive touch screen.

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